B&M 40227 TRANSPAK - Manual (Page 10)

Three different types of Throttle Valve (TV) linkages
have been used on the Ford AOD transmission since its
introduction. The earliest linkage consisted of a bent rigid
rod connecting the carburetor and transmission while
most late model AOD’s use one of two different flexible
cable type linkages. NOTE: Special tools and a pressure
gage will be required depending on the particular TV
linkage type you are working on. Adjustment procedure
for each of the TV linkage types are presented in the
following sections.
1. Carburetor adjustment
Perform the following steps prior to adjusting TV
linkage.
1.1Check/adjust the engine curb idle speed to specifica-
tion. Refer to the Engine/Emissions Diagnosis manual
for procedures to adjust throttle solenoid applications.
Make sure the curb idle speed is set to specification
with and without the throttle solenoid positioner (anti-
dieseling solenoid) energized, if so equipped.
1.2Shut engine off. Remove air cleaner.
1.3De-cam the fast idle cam on the carburetor so that the
throttle lever is against the idle stop or throttle solenoid
positioner stop.
Rod type TV control system.
The TV control linkage system consists of a linkage
lever on the carburetor, the TV control rod assembly and
an external TV control lever on the transmission. (See
Fig. 9.) The TV control rod transmits motion between the
carburetor linkage lever and the TV control lever on the
transmission. The carburetor linkage lever has an adjust-
ment screw for limited TV linkage Adjustment. The exter-
nal TV control lever actuates the internal TV control
mechanism which regulates TV control pressure.
The TV control rod is set to its proper length during
initial assembly using the sliding trunnion block at the
transmission end of the TV control rod assembly. Under
normal circumstances it should not be necessary to alter
this Adjustment. Any required adjustment can normally be
made using the adjustment screw on the carburetor
linkage lever.
When the linkage is correctly adjusted, the TV control
lever on the transmission will be at its internal stop
position when the carburetor lever is at its minimum idle
stop. There will be light contact force between the throttle
lever and the end of the linkage lever adjustment screw.
Due to the flexibility in the TV linkage the adjustment
screw would have to be backed out several turns before
a gap between the screw and throttle lever could be
detected.
Before any engine TV linkage adjustment can be done,
the throttle lever at the carburetor (or throttle body) must
be positioned at its minimum idle stop.
2. Linkage Adjustment at Carburetor
Adjust the TV control linkage at the carburetor using the
following procedure (See Fig. 9.):
10
TV LINKAGE ADJUSTMENT
2.1Set carburetor at minimum idle stop as described in
steps 1 thru 3. Place shift lever in NEUTRAL and set
parking brake. CAUTION: The transmission selector
lever must be in NEUTRAL in when adjusting the TV
linkage.
2.2Back (turn CCW) the linkage lever adjusting screw all
the way out (until screw end is flush with lever face).
2.3Turn the adjusting screw in (CW) until a thin shim of
.127mm (0.005 inch) maximum, or piece of writing
paper fits snug between end of screw and throttle
lever. NOTE: To eliminate effect of friction, push
linkage lever forward (tending to close gap) and re-
lease before checking clearance between end of screw
and throttle lever. Do not apply any load on levers with
tools or hands while checking gap.
2.4Turn the adjusting screw in (CW) an additional three
turns. (Three turns are preferred. One turn minimum is
permissible if screw travel is limited).
2.5 If it is not possible to turn in adjusting screw at least one
additional turn (from initial gap) or if there was insuffi-
cient screw adjusting capacity to obtain an initial gap
in Step 5, refer to Linkage Adjustment at Transmis-
sion.
Idle Speed Adjustment
Whenever it is required to adjust idle speed by more than
50 rpm, the adjustment screw on the linkage lever at the
carburetor should also be readjusted as follows:
Idle Speed Change
Linkage Adjustment
at Carburetor
50 rpm or more Check TV lever adjustment
decrease at carburetor
Less than 50 rpm No change required
50 rpm or more Check TV lever adjustment
increase at carburetor
After making any idle speed adjustments, always verify
that the linkage lever and throttle lever are in contact with
the throttle lever at its idle stop (or throttle solenoid
positioner) and the shift lever is in NEUTRAL.
3. Rod Linkage Adjustment at Transmission
Figure 9